Table 2.
Means ± standard deviations (continuous) or percentages and frequencies (categorical) of covariates by NNNS profile groupings.
| Sample Characteristics | Profiles 2,3,4,5 (N = 438) | Profile 1 (Optimal) (N = 62) | Profile 6 (Atypical) (N = 36) |
|---|---|---|---|
| Infant Gender: Male | 55.3% (242/438) | 56.5% (35/62) | 61.1% (22/36) |
| Recruitment Site: | |||
| WIH | 19.4% (85/438) | 3.2% (2/62) | 19.4% (7/36) |
| SHD | 22.6% (99/438) | 1.6% (1/62) | 0.0% (0/36) |
| KMC | 16.0% (70/438) | 17.7% (11/62) | 19.4% (7/36) |
| CMH* | 14.8% (65/438) | 8.1% (5/62) | 0.0% (0/36) |
| WFU* | 14.6% (64/438) | 67.7% (42/62) | 22.2% (8/36) |
| LAB* | 12.6% (55/438) | 1.6% (1/62) | 38.9% (14/36) |
| PMA at Buccal Collection (weeks) | 38.930 ± 3.150 | 39.415 ± 4.012 | 40.210 ± 3.462 |
| PMA at Birth (weeks) | 27.091 ± 1.881 | 26.756 ± 1.954 | 26.452 ± 2.154 |
| Birth Weight (grams) | 969.0 ± 281.4 | 903.8 ± 265.0 | 861.9 ± 291.4 |
| Maternal Age at childbirth (years) | 29.171 ± 6.297 | 29.095 ± 6.972 | 27.972 ± 6.396 |
| Maternal Smoking During Pregnancy | 16.3% (71/436) | 14.8% (9/61) | 8.3% (3/36) |
| Education: less than High School/GED | 14.6% (62/426) | 6.5% (4/62) | 22.2% (8/36) |
| Low SES | 8.2% (35/427) | 4.8% (3/62) | 16.7% (6/36) |
| Maternal Race: | |||
| White | 55.0% (236/429) | 52.5% (32/61) | 27.8% (10/36) |
| Black | 21.9% (94/429) | 29.5% (18/61) | 19.4% (7/36) |
| Asian | 7.0% (30/429) | 9.8% (6/61) | 11.1% (4/36) |
| Hawaiian or Pacific Islander | 6.8% (29/429) | 6.6% (4/61) | 13.9% (5/36) |
| Other | 9.3% (40/429) | 1.6% (1/61) | 27.8% (10/36) |
PMA: Postmenstrual Age, SES: socioeconomic status, GED: General Equivalency Diploma, NNNS: NICU network neurobehavioral scale, *enrolled from 2 university-affiliated NICUs.